(WO9501222-A1)      A catalyst for the redn. of NOx by methane or any mixt. contg. methane (such as natural gas) in an oxidising atmos., which comprises an MFI-type zeolite exchanged with 0.3-2.0% of Pd, relative to total wt. of catalyst.    Also claimed is the redn. process which gives selective redn. of Nox to N2 and simultaneous oxidn. of CO to CO2 and CH4 to CO2.    USE -   The catalyst can be used in an oxidising medium with CH4-natural gas or petrol in the presence of water and with a low concn. of Pd.    ADVANTAGE -   Former process for redn. of NOx have used other catalysts (such as V2O5 or WO3 or TiO2) which have a limited life, and reducing agents such as NH3 which is difficult to stock. Co-contg. catalysts have been used but these produce cobalt carbonyl cpds., which are toxic.    The catalyst of the invention does not produce toxic cpds. and can thus be used in catalytic convertors in vehicles functioning with natural gas.    (JP8500772-W)      A catalyst for the redn. of NOx by methane or any mixt. contg. methane (such as natural gas) in an oxidising atmos., which comprises an MFI-type zeolite exchanged with 0.3-2.0% of Pd, relative to total wt. of catalyst.    Also claimed is the redn. process which gives selective redn. of Nox to N2 and simultaneous oxidn. of CO toCO2 and CH4 to CO2.    USE -   The catalyst can be used in an oxidising medium with CH4-natural gas or petrol in the presence of water and with a low concn. of Pd.    ADVANTAGE -   Former process for redn. of NOx have used other catalysts (such as V2O5 or WO3 or TiO2) which have a limited life, and reducing agents such as NH3 which is difficult to stock. Co-contg. catalysts have been used but these produce cobalt carbonyl cpds., which are toxic.    The catalyst of the invention does not produce toxic cpds. and can thus be used in catalytic convertors in vehicles functioning with natural gas.    (US5811067-A)      A catalyst for the redn. of NOx by methane or any mixt. contg. methane (such as natural gas) in an oxidising atmos., which comprises an MFI-type zeolite exchanged with 0.3-2.0% of Pd, relative to total wt. of catalyst.    Also claimed is the redn. process which gives selective redn. of Nox to N2 and simultaneous oxidn. of CO toCO2 and CH4 to CO2.    USE -   The catalyst can be used in an oxidising medium with CH4-natural gas or petrol in the presence of water and with a low concn. of Pd.    ADVANTAGE -   Former process for redn. of NOx have used other catalysts (such as V2O5 or WO3 or TiO2) which have a limited life, and reducing agents such as NH3 which is difficult to stock. Co-contg. catalysts have been used but these produce cobalt carbonyl cpds., which are toxic.    The catalyst of the invention does not produce toxic cpds. and can thus be used in catalytic convertors in vehicles functioning with natural gas.    (EP656810-B1)      A catalyst for the redn. of NOx by methane or any mixt. contg. methane (such as natural gas) in an oxidising atmos., which comprises an MFI-type zeolite exchanged with 0.3-2.0% of Pd, relative to total wt. of catalyst.    Also claimed is the redn. process which gives selective redn. of Nox to N2 and simultaneous oxidn. of CO toCO2 and CH4 to CO2.    USE -   The catalyst can be used in an oxidising medium with CH4-natural gas or petrol in the presence of water and with a low concn. of Pd.    ADVANTAGE -   Former process for redn. of NOx have used other catalysts (such as V2O5 or WO3 or TiO2) which have a limited life, and reducing agents such as NH3 which is difficult to stock. Co-contg. catalysts have been used but these produce cobalt carbonyl cpds., which are toxic.    The catalyst of the invention does not produce toxic cpds. and can thus be used in catalytic convertors in vehicles functioning with natural gas.