catalysts

• This process relies on a catalyst of high selectivity and weak activity .
  这过程所靠的是一种高选择性和低活性的催化剂。
• Commercially two main types of hydrogenations are carried out with nickel catalyst .
  商业上采用的以镍作催化剂的氢化有两种。
• The effect of these catalysts is greater at low pressures than at high pressures .
  在低压下这些催化剂的作用要比在高压下为大。
• The relative small size means many more particles for a given volume of catalyst .
  这种比较小的尺寸就意味着在一定体积内颗粒较多。
• You consider large volume commodity catalysts where often the profit margins are slim .
  应当考虑到大量商品催化剂和利润率往往较小。
• The catalyst for this reaction is iron chromium oxide with graphite as a binder .
  进行这种反应的催化剂是以石墨为粘接剂的铁铬氧化物。
• Many processes that are essential to the chemical industry use heterogeneous catalysts .
  很多重要的化学工业过程就是使用多相催化剂的。
• The heterogeneous catalyst first attracts the salt to its surface and holds it there .
  多相催化剂先将盐吸附在它的表面并使它固定在那里。
• One may also adjust the conditions to monitor the desorption of adsorbate from the catalyst .
  也可以调节条件以检测催化剂上吸附质的解吸。
• A bottom layer of nickel catalyst was provided to promote the endothermic reaction of steam and methane .
  底层镍催化剂促进蒸汽和甲烷的吸热反应。