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为了得到对低温烃类水蒸汽转化有效的催化剂,我们以正庚烷水蒸汽反应作为试验反应,进行了实验工作。用不同来源的镍制备了Ni-WO_3催化剂,在下述条件下进行了活性试验:温度450～600℃(通常500℃),压力1大气压,空速3000hr~(-1),催化剂体积3.3毫升,H_2O/n-C_7H_(16)=2.2～20.5克分子比(通常取15.7),反应时间～8小时。此外,还对催化剂作了x射线衍射研究。实验结果表明,在适当的反应条件下,每种Ni-WO_3催化剂都得到高产率的一氧化碳,而在催化剂上的积碳是轻微的。特别是由甲酸镍和三氧化钨制备的催化剂显示出高的活性,高产率的一氧化碳和高的耐压强度。而且,发现要获得一种有效催化剂,镍含量由40％到60％是合适的。
In order to obtain a catalyst that is effective for steam reforming of low-temperature hydrocarbons, we conducted a pilot project using n-heptane steam as the experimental reaction. Ni-WO 3 catalysts were prepared from nickel from different sources and the activity was tested under the following conditions: temperature of 450-600 ℃ (usually 500 ℃), pressure of 1 atm, space velocity of 3000 hr -1, catalyst volume of 3.3 ml, H_2O / n-C_7H_ (16) = 2.2 ~ 20.5 molar ratio (usually take 15.7), the reaction time ~ 8 hours. In addition, the catalysts were also investigated by X-ray diffraction. The experimental results show that under appropriate reaction conditions, each of the Ni-WO 3 catalysts yields high yields of carbon monoxide, whereas the carbon deposits on the catalyst are minor. In particular, catalysts prepared from nickel formate and tungsten trioxide show high activity, high yield of carbon monoxide and high compressive strength. Moreover, it has been found that from 40% to 60% nickel is suitable for obtaining a potent catalyst.