Ni—MgO—ZnO solid catalysts for syngas preparation and process for the preparation thereof
The present invention provides a process and catalyst for the production of synthesis gas (a mixture of CO and H 2 ) by reforming of methane with carbon dioxide. The process provides a direct single step selective vapor phase dry reforming of methane with carbon dioxide to produce synthesis gas over Ni—MgO—ZnO catalyst between temperature range of 600° C. to 800° C. at 1 atmospheric pressure. The process provides a methane conversion of 5-95% with H 2 to CO mole ratio of 0.83-1.2.
1. A process for the preparation of a Ni—MgO—ZnO solid catalyst, the catalyst comprising:
a) Ni in the range of 2-10%,
b) MgO in the range of 2-10% and
c) ZnO in the range of 90-95%,
wherein the said process comprises the steps of:
i. dissolving Zinc nitrate hexahydrate and Magnesium nitrate hexahydrate in water,
ii. adding Nickel nitrate hexahydrate in water to the mixture as obtained in step (i) followed by stirring to obtain a homogenous mixture;
iii. adding a solution of CTAB (cetyltrimethylammonium bromide) in ethanol to the mixture as obtained in step (ii) with stirring for period in the range of 1 to 2 hours followed by adding hydrazine hydrate with adjusting the pH of the solution in the range of 8-12 to obtain a solution,
iv. stirring the solution as obtained in step (iii) for a period in the range of 1-3 hours followed by autoclaving for period in the range of 12 to 48 hours at a temperature in the range of 160 to 180° C. to obtain a precipitate;
v. filtering the precipitate as obtained in step (iv) with water and drying at a temperature ranging between 60 to 110° C. for a time period ranging between 12-20 hours followed by calcining at a temperature in the range of 400-750° C. for a time period of 4-8 hours to obtain the Ni—MgO—ZnO catalyst.
2. The process as claimed in claim 1 , wherein the Ni to Ni—MgO—ZnO of the catalyst varied in the range of 2 to 10%.