Abstract: A vehicle exhaust system includes a first exhaust gas path and a second exhaust gas path. At least one valve is positioned within the first exhaust gas path and an active noise control system is associated with the second exhaust gas path. An example method includes, providing the first exhaust gas path with a first tailpipe having a first outlet and the second exhaust gas path with a second tailpipe having a second outlet separate from the first outlet. The valve and the active noise control system are controlled simultaneously to control noise generated by the vehicle exhaust system.

Abstract: A process for the continuous production of hydrogen from methane and/or natural gas and/or methane-rich hydrocarbons and steam at low temperature, using a solid catalyst comprising group VIII metal oxide(s) in two parallel reactors, comprising reducing the solid catalyst in both the reactors by contacting the catalyst with a gaseous feed comprising a reducing agent, contacting a first gaseous feed comprising methane and/or natural gas and/or methane rich hydrocarbons, simultaneously contacting a second gaseous feed comprising steam called Feed-B with the solid catalyst reduced in step-i in a second reactor. while regularly switching over the two feeds, Feed-A arid Feed-B, between the two parallel reactors to obtain a mixed product stream comprising hydrogen from the two reactors.

Abstract: A process for the activation of perovskite-type oxide by increasing its surface area and/or catalytic activity, which comprises: (i) treating perovskite-type oxide hydrothermally with liquid water with water/perovskite-type oxide ratio of above 0.1 at temperature of 50°-500° C. and period of 0.1-100 h under autogeneous pressure and drying the resulting mass or treating perovskite-type oxide hydrothermally with water vapors with or without any inert gas at space velocity of above 100 h−1, temperature of 200°-1000° C. and a period of 0.1-100 h and (ii) calcining the hydrothermally treated perovskite-type oxide in air or inert gas or under vacuum at temperature of 300°-1000° C. for a period of 0.1-100 h.