Method for preparing furfural by catalytically pyrolyzing forestry waste through waste platinum and palladium acid leaching residues
The rapid pyrolysis of forestry waste by catalyzing waste platinum palladium acid leach slag is solved, and the problems of low product selection rate and poor bio-oil quality in traditional pyrolysis methods are achieved, and the efficient production of furfural-rich bio-oil is improved, and the resource reuse rate is improved. Economic benefits.
Patent Information
- Application Number
- CN202411596469.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-01-10
AI Technical Summary
In the prior art, the pyrolysis method of forestry waste has the problems of low product selection rate and poor bio-oil quality, and the reuse rate of waste platinum palladium acid leach slag is low, resulting in high production cost of furfural.
The waste platinum palladium acid leach slag catalyzed quickly and the forestry waste is rapidly pyrolysis at 400~800 °C after pulverization, drying and sieving, and the waste platinum palladium acid leach slag is used as a catalyst to improve furfural and biological Oil yield.
The furfural yield was achieved as high as 95.43%, and the bio-oil yield was as high as 74.87%, which significantly improved the secondary utilization rate of resources, reduced the production cost of furfural and improved economic benefits.
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Figure CN119285586A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of biomass thermal conversion and efficient utilization of biomass energy, and in particular to a method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum-palladium acid leaching residue. Background Art
[0002] Furfural is a promising organic chemical precursor that can be used to produce a variety of high-value-added chemicals, such as L-acetic acid, tetrahydrofuran and diols, as well as fuels such as various alkanes. In 2024, the global furfural market will exceed US$700 million, and it is expected that by 2027, the market size and revenue will reach approximately 0.6 tons and US$1.2 billion, respectively. At present, furfural production is mainly obtained by dissolving or hydrolyzing forestry waste, which produces a large amount of acidic waste liquid in the process, posing a significant risk to the environment. In contrast, rapid pyrolysis is a very promising method for chemical production. It has the advantages of high bio-oil yield, fast reaction speed, and no need for additional additives. It is a new technology that is expected to replace traditional furfural production methods.
[0003] Forestry waste refers to various wastes generated in the process of forestry production, mainly including branches, leaves, bark, roots, wood chips, sawdust, waste wood and scraps generated in the process of forestry processing. These wastes are usually regarded as "wastes", but in fact they contain rich biomass energy and usable resources. As an important source of biomass energy, the conversion and utilization of forestry waste has become a research hotspot in the field of renewable energy. Through gasification, pyrolysis, fermentation and other technical means, forestry waste can be converted into energy forms such as electricity, heat, and biofuels.
[0004] Fluidized catalytic cracking is one of the important conversion processes in the oil refining process, which aims to convert heavy oil into more valuable gasoline, diesel and olefin gas. Therefore, about 20,000 to 40,000 tons of waste platinum and palladium acid leaching residues are produced worldwide each year, and the waste catalytic cracking leaching residues contain metals such as Pt, Pd, and Ni, which have high potential utilization value. At present, the commonly used recovery methods are: physical separation, chemical regeneration and acid leaching. The residue after acid leaching (mainly γ-Al2O3 and ZSM-5 zeolite) still contains a small amount of precious metals, but is usually landfilled or made into bricks. This treatment method is a waste of precious metals with catalytic potential and zeolite and γ-Al2O3 as catalytic carriers. Therefore, the reuse of waste platinum and palladium acid leaching residues can not only improve the secondary utilization rate of waste resources, but also further prepare high value-added products.
[0005] Therefore, it is necessary to study the method of preparing furfural by catalytic pyrolysis of forestry waste by waste platinum and palladium acid leaching residue in order to solve the above technical problems. Summary of the invention
[0006] The purpose of the present invention is to provide a method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum and palladium acid leaching residue. The present invention uses forestry waste as raw materials, adopts a rapid pyrolysis method to prepare furfural-rich bio-oil, and increases the furfural yield and bio-oil yield by adding waste platinum and palladium acid leaching residue.
[0007] To achieve the above object, the present invention provides a method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum and palladium acid leaching residue, comprising the following steps: The waste platinum and palladium acid leaching residues and forestry wastes are crushed, dried, and sieved respectively, and then mixed according to a proportion to obtain a mixed powder; Under an inert atmosphere, the mixed powder is rapidly pyrolyzed at 400-800 °C and kept warm; After the heat preservation is completed and the product is cooled, the pyrolysis product is condensed and separated to obtain the furfural-rich bio-oil.
[0008] Specifically, during the rapid pyrolysis process, forestry waste is pyrolyzed into a variety of organic matter, which is further converted into furfural after being catalyzed by waste platinum palladium acid leaching residue, and the target component is collected in the liquid product. By using forestry waste as raw material and adding waste platinum palladium acid leaching residue as a catalyst to increase the yield of furfural and bio-oil, a rapid pyrolysis method is used to prepare furfural-rich bio-oil; this preparation method makes the bio-oil yield, furfural yield and furfural content as high as 74.87%, 95.43% and 99.77 mg / mL respectively, which is of great significance to the reuse of waste platinum palladium acid leaching residue and the efficient production of furfural.
[0009] Specifically, the waste platinum-palladium acid leaching residue is the waste residue remaining after the waste catalytic cracking leaching residue is extracted by acid leaching.
[0010] Furthermore, the forestry waste in step (1) is forestry waste such as waste wood chips, tree roots, and tree bark.
[0011] Furthermore, the mass ratio of the forestry waste to the waste platinum-palladium acid leaching residue in step (1) is 1:1-5.
[0012] Furthermore, the inert atmosphere in step (2) is nitrogen or argon with a flow rate of 10-50 mL / min.
[0013] Furthermore, the rapid pyrolysis in step (2) is performed by heating the vertical tube furnace to 400-800°C, introducing an inert gas into a glass tube containing the mixed powder and placing the tube in a heating zone of the vertical tube furnace for rapid pyrolysis.
[0014] Furthermore, the insulation time in step (2) is 5 to 30 min.
[0015] Furthermore, the sieving in step (1) is performed through 80-200 mesh.
[0016] The leaching residue of the present invention adopts waste platinum-palladium acid leaching residue produced by the petrochemical industry, and utilizes its remaining catalytic performance to realize the conversion of waste biomass into high value-added chemicals. Compared with traditional landfill or brick making methods, the secondary utilization rate of resources is improved, the production cost of furfural is greatly reduced, and the economic benefit is improved.
[0017] The biomass raw material used in the present invention is forestry waste. Compared with the traditional method of incineration or natural decomposition, it is pyrolyzed into high-value furfural-rich bio-oil, which has extremely high economic value and realizes high-value recycling of waste.
[0018] The present invention utilizes waste platinum and palladium acid leaching residue to catalyze the pyrolysis of forestry waste to prepare furfural-rich bio-oil, which solves the problems of low product selectivity and poor bio-oil quality in traditional rapid pyrolysis methods. The yield of the target product furfural is as high as 95.43%, and the bio-oil yield is as high as 74.87%, realizing the innovation of rapid pyrolysis technology.
[0019] The furfural-rich bio-oil prepared by the present invention has a furfural content of up to 99.77 mg / mL and is a promising platform chemical that can be used to produce a variety of high value-added chemicals, such as L-acetic acid, tetrahydrofuran and diols, as well as various alkanes and other fuels. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a process flow chart of the present invention.
[0021] Figure 2 is the yield of bio-oil in Examples 1, 2, 3, 4, 5 and 6.
[0022] Figure 3 It is the yield of furfural in Examples 1, 2, 3, 4, 5 and 6. DETAILED DESCRIPTION
[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limitations of the present invention. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. Example 1
[0024] like Figure 1As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum-palladium acid leaching residue comprises the following specific steps: crushing, drying and sieving 2 g of sawdust to a particle size of 80 meshes. After the vertical tube furnace is heated to 600 °C, a glass tube containing sawdust powder is introduced with nitrogen at a flow rate of 10 mL / min and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and heat preservation for 10 min. In this process, biomass with waste wood as raw material is pyrolyzed into various organic substances, and the pyrolysis products are condensed and separated to obtain bio-oil.
[0025] The bio-oil collected in the above process was weighed and analyzed by GC-MS. The yield of bio-oil was 52.03wt.% ( Figure 2 ), the yield of furfural was 7.75% ( Figure 3 ). Example 2
[0026] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of sawdust and 2 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to the sawdust and mixed evenly to obtain a mixed powder, wherein the mass ratio of the sawdust to the waste platinum palladium acid leaching residue is 1:1.
[0027] After the vertical tube furnace was heated to 600 ℃, nitrogen at a flow rate of 10 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 10 min. During this process, the biomass with waste wood as raw material was pyrolyzed into various organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0028] The bio-oil collected in the above process was weighed and analyzed by GC-MS. The yield of bio-oil was 63.29wt.% ( Figure 2 ), the yield of furfural was 16.21% ( Figure 3 ). Example 3
[0029] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of sawdust and 4 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to the sawdust and mixed evenly to obtain a mixed powder, wherein the mass ratio of the sawdust to the waste platinum palladium acid leaching residue is 1:2.
[0030] After the vertical tube furnace was heated to 600 ℃, nitrogen at a flow rate of 10 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 10 min. During this process, the biomass with waste wood as raw material was pyrolyzed into various organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0031] The bio-oil collected in the above process was weighed and analyzed by GC-MS. The yield of bio-oil was 67.72wt.% ( Figure 2 ), the yield of furfural was 52.64% ( Figure 3 ). Example 4
[0032] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of sawdust and 6 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to the sawdust and mixed evenly to obtain a mixed powder, wherein the mass ratio of the sawdust to the waste platinum palladium acid leaching residue is 1:3.
[0033] After the vertical tube furnace was heated to 600 ℃, nitrogen at a flow rate of 10 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 10 min. During this process, the biomass with waste wood as raw material was pyrolyzed into various organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0034] The bio-oil collected in the above process was weighed and analyzed by GC-MS. The yield of bio-oil was 71.46wt.% ( Figure 2 ), the yield of furfural was 77.87% ( Figure 3 ). Example 5
[0035] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of sawdust and 8 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to the sawdust and mixed evenly to obtain a mixed powder, wherein the mass ratio of the sawdust to the waste platinum palladium acid leaching residue is 1:4.
[0036] After the vertical tube furnace was heated to 600 ℃, nitrogen at a flow rate of 10 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 10 min. During this process, the biomass with waste wood as raw material was pyrolyzed into various organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0037] The bio-oil collected in the above process was weighed and analyzed by GC-MS. The yield of bio-oil was 74.87wt.% ( Figure 2 ), the yield of furfural was 95.41% ( Figure 3 ). Example 6
[0038] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of sawdust and 10 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to the sawdust and mixed evenly to obtain a mixed powder, wherein the mass ratio of the sawdust to the waste platinum palladium acid leaching residue is 1:5.
[0039] After the vertical tube furnace was heated to 600 ℃, nitrogen at a flow rate of 10 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 10 min. During this process, the biomass with waste wood as raw material was pyrolyzed into various organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0040] The bio-oil collected in the above process was weighed and analyzed by GC-MS. The yield of bio-oil was 74.90wt.% ( Figure 2 ), the yield of furfural was 95.43% ( Figure 3 ). Example 7
[0041] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of sawdust and 8 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to the sawdust and mixed evenly to obtain a mixed powder, wherein the mass ratio of the sawdust to the waste platinum palladium acid leaching residue is 1:4.
[0042] After the vertical tube furnace was heated to 400 ℃, nitrogen at a flow rate of 10 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 10 min. During this process, the biomass with waste wood as raw material was pyrolyzed into various organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0043] The bio-oil collected in the above process was weighed and then analyzed by GC-MS. The yield of bio-oil was 66.57wt.%, the yield of furfural was 95.31%, and the content of furfural was 60.60 mg / mL. Example 8
[0044] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of sawdust and 8 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to the sawdust and mixed evenly to obtain a mixed powder, wherein the mass ratio of the sawdust to the waste platinum palladium acid leaching residue is 1:4.
[0045] After the vertical tube furnace was heated to 500 ℃, nitrogen at a flow rate of 10 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 10 min. During this process, the biomass with waste wood as raw material was pyrolyzed into a variety of organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0046] The bio-oil collected in the above process was weighed and then analyzed by GC-MS. The yield of bio-oil was 73.87wt.%, the yield of furfural was 95.74%, and the content of furfural was 99.77 mg / mL. Example 9
[0047] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of sawdust and 8 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to the sawdust and mixed evenly to obtain a mixed powder, wherein the mass ratio of the sawdust to the waste platinum palladium acid leaching residue is 1:4.
[0048] After the vertical tube furnace was heated to 700 ℃, nitrogen at a flow rate of 10 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 10 min. During this process, the biomass with waste wood as raw material was pyrolyzed into a variety of organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0049] The bio-oil collected in the above process was weighed and then analyzed by GC-MS. The yield of bio-oil was 60.45wt.%, the yield of furfural was 95.23%, and the content of furfural was 91.67 mg / mL. Example 10
[0050] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of bark and 8 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to tobacco stems and mixed evenly to obtain a mixed powder, wherein the mass ratio of tobacco stems to the waste platinum palladium acid leaching residue is 1:4.
[0051] After the vertical tube furnace was heated to 500°C, nitrogen at a flow rate of 10 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 10 min. During this process, the biomass with bark as raw material was pyrolyzed into a variety of organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0052] The bio-oil collected in the above process was weighed and then analyzed by GC-MS. The yield of bio-oil was 71.36wt.%, the yield of furfural was 95.17%, and the content of furfural was 92.38 mg / mL. Embodiment 11
[0053] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of tree roots and 8 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to corn stalks and mixed evenly to obtain a mixed powder, wherein the mass ratio of corn stalks to the waste platinum palladium acid leaching residue is 1:4.
[0054] After the vertical tube furnace was heated to 500°C, nitrogen at a flow rate of 10 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 10 min. During this process, the biomass with tree roots as raw materials was pyrolyzed into a variety of organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0055] The bio-oil collected in the above process was weighed and then analyzed by GC-MS. The yield of bio-oil was 70.28wt.%, the yield of furfural was 95.06%, and the content of furfural was 94.76 mg / mL. Example 12
[0056] like Figure 1 As shown, the method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum palladium acid leaching residue comprises the following specific steps: 2 g of tree leaves and 8 g of waste platinum palladium acid leaching residue are crushed, dried, and sieved to particle sizes of 80 and 200 mesh respectively, and then the waste platinum palladium acid leaching residue is added to wheat straw and mixed evenly to obtain a mixed powder, wherein the mass ratio of wheat straw to the waste platinum palladium acid leaching residue is 1:4.
[0057] After the vertical tube furnace was heated to 500 ℃, nitrogen at a flow rate of 50 mL / min was introduced into the glass tube containing the mixed powder and then placed in the heating zone of the vertical tube furnace for rapid pyrolysis and kept warm for 5 min. During this process, the biomass with leaves as raw materials was pyrolyzed into various organic matter, which was further converted into furfural after catalysis by waste platinum-palladium acid leaching residue. The pyrolysis products were condensed and separated to obtain bio-oil.
[0058] The bio-oil collected in the above process was weighed and then analyzed by GC-MS. The yield of bio-oil was 72.21wt.%, the yield of furfural was 95.54%, and the content of furfural was 99.21 mg / mL.
[0059] In summary, the present invention uses waste platinum palladium acid leaching residue and forestry waste as raw materials. In the rapid pyrolysis process, the forestry waste is pyrolyzed into a variety of organic matter, which is further converted into furfural after being catalyzed by the waste platinum palladium acid leaching residue, and the target component is collected in the liquid product. By using forestry waste as raw materials and adding waste platinum palladium acid leaching residue as a catalyst to increase the furfural yield and bio-oil yield, a rapid pyrolysis method is used to prepare furfural-rich bio-oil; the preparation method makes the bio-oil yield, furfural yield and furfural content as high as 74.87%, 95.43% and 99.77 mg / mL respectively, which is of great significance to the reuse of waste platinum palladium acid leaching residue and the efficient production of furfural.
[0060] The above disclosure is only part of the embodiments of the present invention, which cannot be used to limit the scope of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention are still within the scope of the invention.
Claims
1. A method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum and palladium acid leaching residue, characterized in that: The steps include: The waste platinum and palladium acid leaching residues and forestry wastes are crushed, dried, and sieved respectively, and then mixed according to a proportion to obtain a mixed powder; Under an inert atmosphere, the mixed powder is rapidly pyrolyzed at 400-800 °C and kept warm; After the heat preservation is completed and the product is cooled, the pyrolysis product is condensed and separated to obtain furfural-rich bio-oil.
2. The method for preparing furfural by catalytic pyrolysis of forestry waste by acid leaching residue of waste platinum and palladium as claimed in claim 1, characterized in that: The mass ratio of the forestry waste to the waste platinum-palladium acid leaching residue in step (1) is 1:1-5.
3. The method for preparing furfural by catalytic pyrolysis of forestry waste by acid leaching residue of waste platinum and palladium as claimed in claim 1, characterized in that: The inert atmosphere in step (2) is nitrogen or argon with a flow rate of 10-50 mL / min.
4. The method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum and palladium acid leaching residue as claimed in claim 1, characterized in that: The rapid pyrolysis in step (2) is as follows: after heating the vertical tube furnace to 400-800°C, an inert gas is introduced into the glass tube containing the mixed powder and the tube is placed in the heating zone of the vertical tube furnace for rapid pyrolysis.
5. The method for preparing furfural by catalytic pyrolysis of forestry waste by acid leaching residue of waste platinum and palladium as claimed in claim 1, characterized in that: The insulation time in step (2) is 5 to 30 min.
6. The method for preparing furfural by catalytic pyrolysis of forestry waste by waste platinum and palladium acid leaching residue as claimed in claim 1, characterized in that: The sieving in step (1) is performed through a 80-200 mesh sieve.