39results about How to "Sintering resistant" patented technology

The invention relates to a lithium-aluminium hydrotalcite-derived nickle-based catalyst used for hydrogen production by acetic acid auto-thermal reforming. In order to solve the problem that for existing catalysts, in acetic acid auto-thermal reforming reaction, change of catalyst structures and oxidation and sintering of active components cause inactivation of the catalysts, the novel catalyst which is stable in structure, sintering-resistant, carbon-deposition-resistant and oxidation-resistant is provided. Chemical components of the catalyst are (LiO0.5)a(NiO)b(AlO1.5)c, wherein a is 1.47-3.63, b is 0.38-0.60, and c is 2.00-4.00. According to the lithium-aluminium hydrotalcite-derived nickle-based catalyst used for hydrogen production by acetic acid auto-thermal reforming, a coprecipitation method is adopted for preparing a precursor of a Li-Al carbonate hydrotalcite structure, through calcination, the nickel aluminate Li-Ni-Al-O compound oxide catalyst with lithium partially replaced is obtained, gasification of a carbon-containing intermediate is promoted, and the thermal stability and the catalytic activity of the catalyst in the acetic acid auto-thermal reforming reaction areimproved.

The invention relates to a yttrium-manganese-nickel perovskite type catalyst for producing hydrogen by autothermal reforming of acetic acid. Aiming at the problem of catalyst deactivation in the autothermal reforming reaction of acetic acid in the existing catalyst, the present invention adopts a hydrothermal method to use Ni as an active component, introduces Y element, and partially replaces Ni by Mn element, forming mesoporous Y (Mn ,Ni)O 3 The perovskite-like structure catalyst improves the dispersion and stability of the active component nickel, and induces the efficient conversion of acetic acid, obtaining a new catalyst with high sintering resistance, coke resistance and high activity. The chemical composition of the catalyst of the present invention is (NiO) a (MnO 2 ) b (YO 1.5 ) c , where a is 0.39, b is 0.61, and c is 0.5.

The invention relates to a praseodymium-zirconium composite oxide cobalt-based catalyst for producing hydrogen by autothermal reforming of acetic acid. Aiming at the deactivation problems such as the change of catalyst structure, sintering and carbon deposition in the existing catalyst in the autothermal reforming reaction of acetic acid, the present invention adopts the sol-gel method to prepare Co 3 o 4 and Pr-doped t‑ZrO 2 The Zr-Pr-O composite oxide cobalt-based catalyst limits the aggregation of active components and the growth of grains, and significantly improves the catalyst's anti-coking, anti-sintering ability and hydrogen production rate. Catalyst chemical composition of the present invention is (PrO 1.5 ) a (ZrO 2 ) b (CoO 1.5 ) c , where a is 0‑0.19 and not 0, b is 0.43‑0.69, and c is 0.17‑0.21.

The invention relates to a hydrocalumite derived cobalt-based catalyst for hydrogen production by autothermal reforming of acetic acid. Directed at the problem that catalyst structure change and the oxidation and sintering of active components can cause catalyst deactivation in existing catalysts during the autothermal reforming reaction of acetic acid, the invention provides a new catalyst characterized by stable structure, sintering resistance, oxidation resistance, carbon deposition resistance, and high activity. The molar composition of the catalyst is (CaO)a(CoO)b(AlO1.5) c, wherein a is1.66-5.19, b is 0.34-0.81 and c is 1.0. The invention adopts coprecipitation method to prepare a catalyst precursor, and then roasting is carried out to obtain the Ca-Co-Al-O mesoporous composite oxide. The catalyst takes calcium oxide as the framework, contains cobalt-alumina spinel phase and a small amount of Ca12Al14O33, inhibits the acidity of the catalyst, improves the carbon deposition resistance and sintering resistance of the catalyst, and improves the activity of hydrogen production by autothermal reforming of acetic acid.

The invention relates to a nickel-molybdenum carbide composite catalyst for preparing a synthesis gas through dry reforming of methane, and aims at solving the problem that catalyst deactivation is caused by the situation that active components in the conventional nickel-based catalyst and molybdenum-based catalyst are easy to oxidize and sinter during the process of preparing the synthesis gas through dry reforming of methane. The preparation method of the nickel-molybdenum carbide composite catalyst comprises the following steps: a nickel molybdenum oxide precursor is synthesized through a one-step synthesis urea combustion method by adopting the double components, namely nickel and molybdenum; the virgin gas is subjected to dry reforming through methane, and an Ni-Mo2C composite structure is compounded in situ; carbonization-oxidation circulation of Mo2C is established during the process of dry reforming of methane at the same time, so as to obtain the nickel-molybdenum carbide composite catalyst which is sintering-resistant, oxidation-resistant and stable in structure. According to the nickel-molybdenum carbide composite catalyst, the stability and hydrogen selectivity of the process of preparing the synthesis gas through dry reforming of methane are improved; the chemical composition of the catalyst provided by the invention is Nia (Mo2C)b (Al2O3 )c in which the a is 0.09-0.19, the b is 0.03-0.10 and the c is 0.75-0.88.

The invention relates to a cobalt-cerium-manganese composite oxide solid solution catalyst for hydrogen production by autothermal reforming of acetic acid. Aiming at the problem of catalyst deactivation of an existing catalyst in an acetic acid autothermal reforming reaction, the invention provides an efficient and stable new catalyst. The chemical component of the catalyst provided by the invention is (CoO1.5) a (CeO2) b (MnOx) c, wherein a is 0.15 to 0.19, b is 0.41 to 0.72, and c is 0.09 to 0.44. Co is used as an active component, Ce and Mn are introduced by adopting a coprecipitation method to form the Co / Ce-Mn-Ox composite oxide solid solution catalyst, generation of byproducts such as acetaldehyde and acetone in the reaction process is effectively inhibited, and the yield of hydrogenand the carbon deposition resistance, sintering resistance and oxidation resistance of the catalyst are improved.

The invention relates to a cerium dioxide-loaded strontium-promoted cobalt-based composite oxide catalyst for hydrogen production by autothermal reforming of acetic acid. The invention provides a novel catalyst which is stable in structure and high in activity in order to solve the problem that an existing catalyst is inactivated in an acetic acid autothermal reforming reaction. The molar composition of the catalyst is (SrO) a (CoO1.5) b (CeO2) c, wherein a ranges from 0.75 to 1.75, b ranges from 1.05 to 1.15, and c ranges from 1.50 to 2.50. According to the invention, Co is used as an activecomponent; the cerium dioxide-loaded strontium-promoted cobalt-based composite oxide is prepared by adopting a hydrothermal synthesis method; according to the catalyst, cerium dioxide is used as a skeleton, the catalyst contains a small amount of cobaltosic oxide spinel phase, and the Sr-Co-Ce-O mesoporous composite oxide solid solution catalyst is formed; possible migration, aggregation and sintering of an active component cobalt under a high-temperature condition are effectively inhibited, and the hydrogen yield, sintering resistance and carbon deposition resistance in the acetic acid autothermal reforming process are improved.

The invention relates to a zinc-chromium hydrotalcite derivative nickel-based catalyst for autothermal reforming of acetate to produce hydrogen. In view of the problem that deactivation of the catalyst is caused by change of a catalyst structure of an existing catalyst in autothermal reforming of acetate and oxidation and sintering of active ingredients, the catalyst with stable structure, sintering resistance, carbon accumulation resistance, oxidation resistance and high activity is provided. Chemical components of the catalyst disclosed by the invention are (ZnO)a(NiO)b(CrO1.5)c, wherein a is 0.55 to 0.68, b is 0.12 to 0.18, and c is 0.14 to 0.33. According to the zinc-chromium hydrotalcite derivative nickel-based catalyst disclosed by the invention, a precursor of a Zn-Cr carbonate typehydrotalcite structure is prepared by adopting a co-precipitation method, and nickel as an active ingredient and chromium oxide as an auxiliary are introduced, zinc is replaced by the nickel, and thenickel and the chromium oxide enter into a framework of a hydrotalcite-like substance and a position of a laminated plate; a Zn-Ni-Cr-O compound oxide catalyst containing nickel spinel, which is roasted, is obtained, so that reduction of the nickel is promoted, the catalytic performance of the catalyst is improved, and the stable zinc oxide framework and the spinel structure are formed, and the oxidation resistance, the carbon accumulation resistance and the sintering resistance abilities of the catalyst in the autothermal reforming of the acetate are improved.

The invention relates to an olivine nickel-based catalyst for preparing hydrogen through autothermal reforming of acetic acid. Aiming to solve the problems of low hydrogen yield and oxidation / sintering inactivation of active constituents of the conventional supported nickel-based catalyst in an autothermal reforming process of acetic acid, the invention provides a novel catalyst with the effects of large specific surface area, stable structure, sintering resistance, oxidation resistance and stable activity. The catalyst provided by the invention has a chemical component of MgaFebNicSiO4, wherein a is 1.0-1.7, b is 0-0.7 and c is 0.3-0.5. The nickeliferous catalyst taking an olivine structure as a main body is prepared by a hydro-thermal synthesis method; the catalyst has rich hole structures so that the specific surface area and the dispersity of active constituents of the catalyst are effectively improved; meanwhile, the active constituents, such as nickel and iron, and additives substitute for bivalent magnesium to enter an olivine skeletal structure to effectively refrain the phenomenon of oxidation / sintering inactivation of the catalyst, so that the stability and the hydrogen yield of the catalyst in the autothermal reforming process of acetic acid are improved.

The invention provides a natural gas distributed energy flue gas denitration catalyst and a preparation method thereof. The catalyst provided by the invention has a high temperature resistant carrier,resistance to sintering, and high activity. In a natural gas flue gas denitration process, the carrier titanium dioxide of the catalyst has crystal changes, and loss and sintering of active components due to high temperature, rendering the problems of catalyst deactivation, low denitration efficiency, higher cost, and short life. According to the invention, the problems can be overcome.

The invention relates to a hydrotalcite-like type iron-promoted nickel-based catalyst for hydrogen preparation through autothermal reforming of acetic acid and a preparation method and provides a high-activity novel catalyst resisting oxidation, sintering and carbon deposition to solve the problem that existing catalysts are inactivated due to the structure change as well as oxidation and sintering of active components of the catalysts in the autothermal reforming process of acetic acid. The chemical component of the catalyst is (ZnO)a(NiO)b(AlO1.5)c(FeO1.5)d, wherein a ranges from 0.75 to 3.25, b ranges from 0.25 to 0.75, c ranges from 0 to 1.0 and d ranges from 0 to 1.0. The Zn-Al type carbonate hydrotalcite-like structure is prepared with a co-precipitation method to serve as a precursor, and an active component nickel and an auxiliary iron are introduced and enter the position of the hydrotalcite-like structure through isomorphous substitution of zinc for nickel and isomorphous substitution of aluminum for iron; a compound oxide obtained through sintering effectively inhibits possible migration, accumulation, oxidation and sintering of the active component nickel under the high-temperature reaction condition, and the activity and the stability of the catalyst are improved.

The invention relates to a zinc-nickel-zirconium mesoporous composite oxide catalyst for hydrogen production by autothermal reforming of acetic acid. Directed at the problem that catalyst structure change and the oxidation and sintering of active components can cause catalyst deactivation in existing catalysts during the autothermal reforming reaction of acetic acid, the invention provides a new catalyst characterized by stable structure, sintering resistance, carbon deposition resistance, oxidation resistance, and high activity. The chemical composition of the catalyst is (ZnO)a(NiO)b(ZrO2)c,wherein a is 0.60-2.25, b is 0.40-0.75 and c is 1.00. The invention adopts Ni as the active component, uses ZnO and ZrO2 as the carrier, and adopts coprecipitation method to prepare the Ni / ZnO-ZrO 2composite oxide catalyst, which effectively inhibits the formation of ketene, acetone and other by-products in the reaction process, improves the yield and selectivity of hydrogen, and improves the carbon deposition resistance, sintering resistance and oxidation resistance of the catalyst.