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3566634 
Journal Article 
The accelerating effect of NH4Cl on gas phase reaction of oxidative coupling of methane at elevated pressures 
Liu, Y; Liu, XX; Hou, RL; Xue, JZ; Lia, SB; Shen, SK 
1999 
1 
Applied Catalysis A: General
ISSN: 0926-860X
EISSN: 1873-3875 
Elsevier 
179 
1-2 
L1-L4 
WOS:000079191900001 
The effect of different Cl-containing additives on the gas
phase reaction of oxidative coupling of methane (OCM) at elevated pressures has been
investigated. NH4Cl was found to have the best beneficial effect to improve C-2 selectivity;
however, CH3Cl and C2H4Cl2 have almost no effect on gas phase reaction of OCM at elevated
pressures. We conclude that Cl- and NH3 in NH4Cl or HCl played the key roles in improving the
selectivity to C-2. Although the addition of only NH3 improved the C-2 selectivity very little,
NH3 favored the formation of CI radical in the presence of HCl. The results also imply that Cl
atoms in organic compounds have a different effect from Cl- ion in inorganic compounds on gas
phase reactions of OCM. (C) 1999 Elsevier Science B.V. All rights reserved. 
NH4Cl; accelerating effect; oxidative coupling of methane; gas phase