Tailoring the Physicochemical Properties of Mg Promoted Catalysts via One Pot Non-ionic Surfactant Assisted Co-precipitation Route for CO2 Co-feeding Syngas to Methanol

Autor:	Kamal K. Pant, Komal Tripathi, Rajan Singh
Rok vydání:	2021
Předmět:	010405 organic chemistry Chemistry Coprecipitation General Chemistry 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound Pulmonary surfactant Specific surface area Methanol Crystallite Selectivity Nuclear chemistry Syngas
Zdroj:	Topics in Catalysis. 64:395-413
ISSN:	1572-9028 1022-5528
Popis:	CO2 co-feeding syngas conversion to sustainable fuels and valuable chemicals is one of the promising strategies for partial CO2 abatement. Surface modifications of Mg promoted CuZn based catalysts via one pot non-ionic surfactant assisted co-precipitation route is an effective approach to facilitate the efficient CO/CO2 hydrogenation to methanol. Herein, the influence of different surfactant/(CuZnMg) molar ratios on physicochemical properties and in selective methanol promotion was systematically investigated. The mesostructured CuZnMg (I–III) catalysts with varied molar ratios (0–0.06) led to difference in specific surface area, crystallite size, interaction between the lattices and density of basic sites. For the optimized catalyst CuZnMg (III) (molar ratio = 0.06), the CuO crystallite size, specific surface area and basic sites density was 7.2 nm, 31.23 m2/g and 14.6 µmol/m2 respectively. Furthermore, the CuZnMg (III) displayed the highest exposed well dispersed CuO species and having strong interaction between Cu and ZnO lattice, as confirmed by H2-TPR analysis. Hence, CuZnMg (III) exhibited highest total carbon conversion (33.6%) and maximum methanol selectivity (72.5%) under identical reaction conditions (40 bar, 240 °C, 2000 mL/gcat.h). The effect of process parameters on total carbon conversion and methanol selectivity of CuZnMg (III) catalyst was also evidenced. Interestingly, the methanol selectivity and basic sites density correlates linearly with surfactant molar ratios and both were improved by 30% and 16% respectively for CuZnMg (III) catalyst when compared with conventional catalyst, highlighting the potential of surfactant assisted catalyst (CuZnMg (III)) for CO/CO2 hydrogenation reactions.
Databáze:	OpenAIRE
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