Compound dual-carrier catalyst as well as preparation method and application thereof
A solid acid catalyst, catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of deposition coke, short service life of catalysts, etc., and achieve strong catalytic ability and anti-coking ability. Strong, improve the effect of catalytic capacity and service life
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Embodiment 1
[0034] The preparation of embodiment 1 catalyst
[0035] The characteristics of the molecular sieve carrier (catalyst) used in this example are shown in Table 1. In this example, various catalysts were prepared by an equal-volume impregnation method.
[0036] Table 1 Relevant characteristics of each molecular sieve carrier
[0037]
[0038] Prepare two types of molecular sieve carriers, single carrier and double carrier (single carrier is HBeta, HZSM-5, Al 2 o 3 Active materials Ni and Sn are supported. The double carrier is the single carrier HBeta, HZSM-5, Al 2 o 3 Mix with the mesoporous molecular sieve carrier MCM-41 according to the ratio of mass 1:1, stir for 2h until the active material Ni and Sn are loaded after mixing evenly), including the following steps: (1) Calcination of the carrier ( Figure 6 ): first place the raw material molecular sieve carrier in a muffle furnace and perform calcination under air atmosphere in the following manner of step-by-step tem...
Embodiment 3
[0043] Example 3 Study on characteristics of steam catalytic reforming of wood vinegar with single carrier Ni / Sn catalyst
[0044] Experimental conditions: reaction temperature 600°C; wood vinegar injection volume 0.25g / min; carrier gas N 2 The flow rate is 100mL / min; the catalyst dosage is 10g. The single-support catalysts used are Ni / Sn / HBeta, Ni / Sn / HZSM-5, Ni / Sn / Al 2 o 3 .
[0045] Utilize described single-carrier catalyst to carry out steam catalytic reforming reaction of wood vinegar liquid, the change situation of each component in the gas is as follows figure 2 shown. When Ni / Sn / HBeta catalyst is used, the volume percentage of hydrogen is kept at about 65% in the first 1 h. As the reaction continued, the hydrogen content dropped significantly, from 65% to about 30%. However, the content of CO increased from 5% to 35%, CH 4 The content also increased from 5% to 16%.
[0046] When using the catalyst Ni / Sn / HZSM-5, the content of hydrogen gradually decreased from t...
Embodiment 4
[0053] Example 4 Composite Dual Carrier Catalytic Reforming of Wood Vinegar Liquor Steam Catalytic Reforming Characteristics of Wood Vinegar Liquor
[0054] Experimental conditions for composite dual carrier catalytic reforming of wood vinegar: reaction temperature 600°C; sample volume of wood vinegar 0.25g / min; carrier gas N 2 The flow rate of the catalyst is 100mL / min; the catalyst consumption is 10g (the total mass of the double carrier).
[0055] The catalysts used are Ni / Sn / HBeta+MCM-41; Ni / Sn / HZSM-5+MCM-41; Ni / Sn / Al 2 o 3 +MCM-41.
[0056] Under the action of the composite dual-support catalyst, the changes of each component in the gas are as follows: image 3 shown. When Ni / Sn / HBeta+MCM-41 dual-support catalyst was used, the hydrogen content decreased from 60% to 53% after 2 hours of reaction. Compared with the single-support catalyst, the reduction ratio of hydrogen content was significantly lower. It can be seen that adding the mesoporous molecular sieve catalyst...
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