CO2化学利用的一条新途径

C02开发利用一直是世界各国大型化工企业异常关注的研究课题，但是，由于C02结构稳定，化学活性差，因而决定了该领域的研究课题难度较大，进展比较缓慢．本文报道了一种利用天然气还原C02制备会成气的最新研究结果，该过程不仅可以为破一化学工业提供廉价原料，从而开辟一条极重要的非石油原料的化学工业路线，而且对减缓全球性温室效应也具有一定的社会意义．1实验日分1·1催化剂制备按表1所列组成，以7－AI。0。、硝酸镍、硝酸镁和稀土硝酸盐为原料，采用常规浸渍法参照文献［‘］制备催化剂．1·Zfffe反应评价催化反应评价采用双套管…

A New Route for the Chemical Utilization of CO_2

The catalytic activities of Ni-5 and Ni-5-RM catalysts for reducing CO2 with CH4 or natural gas to produce synthesis gas have been studied by using a fixed-bed flow apparatus. It is found that the Ni-5RM catalyst not only has higher activity and selectivity due to higher dispersion of nickel, but also has better resistance to carbon deposition. It has been shown that a Ni-5-RM catalyst was not deactivated at all during 240h on a stream with CO2/CH4 ratio of 2.4:1 at 750℃ or 1.4:1 at 850℃. For the reduction of CO2 with natural gas, an important question is how to prevent the reaction system from carbon deposition. The experimental results indicate that addition of carboneliminator A into the raw material gases not only prevent carbon deposition, but also has no influence on the activity and selectivity. By adding carboneliminator A to a mixture of natural gas (containing 87% CH4) and CO2 a Ni-5-RM catalyst was not deactivated at all during 300h on a stream with CO2/natural gas ratio of 2.4:1 at 750℃ or 1.4:1 at 850℃. At conditions of 850℃ and CO2/natural gas =1.4:1, the contents of (CO+H2) have been reached to 96% (molar fraction). These results indicate that Ni-5-RM catalyst has a high activity, selectivity and stability for reducing CO2 with natural gas. Experiments magnified 500 times were carried out under the same conditions. The contents of synthesis gas obtained have been kept at 94~96%. These results first established the possibility of industrial utilization of the reduction of CO2 with natural gas to produce synthesis gas rich in carbon monoxide.