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Selective Catalytic Reduction
Selective catalytic reduction (SCR) is a means of converting nitrogen oxides, also referred to as NO
x
with the aid of a catalyst into diatomic nitrogen (N
2
), and water (H
2
O
). A reductant, typically anhydrous ammonia, aqueous ammonia or urea solution, is added to a stream of flue or exhaust gas and is absorbed[citation needed] onto a catalyst. As the reaction drives toward completion, Carbon dioxide, CO
2
is produced. Selective catalytic reduction of NO
x
using ammonia as the reducing agent was patented in the United States by the Engelhard Corporation in 1957. Development of SCR technology continued in Japan and the US in the early 1960s with research focusing on less expensive and more durable catalyst agents
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MTR Bus

MTR Bus is a public bus service in Hong Kong operated by the MTR Corporation. It serves the northwestern part of the New Territories. Also known as MTR Feeder Bus (previously operated by the Kowloon-Canton Railway Corporation as KCR Feeder Bus), it comprises a network of 15 feeder bus routes for the convenience of passengers using the MTR rapid transit network. The routes provide access to and between many MTR stations on the East Rail line, West Rail line and Light Rail.[citation needed] As of December 2014, the MTR Bus fleet comprised 149 buses.[1] The service carried approximately 50 million passengers in 2014[1] and is integrated with MTR's fare system to allow East Rail line, West Rail line and Light Rail passengers who use Octopus cards to enjoy the free feeder bus services that link many housing estates along these lines.

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Alcoa

Alcoa Corporation (a portmanteau of Aluminum Company of America) is an American industrial corporation. It is the world's eighth largest producer of aluminum,[2] with corporate headquarters in Pittsburgh, Pennsylvania.[3] Alcoa conducts operations in 10 countries. Alcoa is a major producer of primary aluminum, fabricated aluminum, and alumina combined, through its active and growing participation in all major aspects of the industry: technology, mining, refining, smelting, fabricating, and recycling.[4] In May 2007 Alcoa Inc. made a US$27 billion hostile takeover bid for Alcan in an attempt to form the world's largest aluminum producer.[5] The bid was withdrawn when Alcan announced a friendly takeover by Rio Tinto in July 2007.[6] On November 1, 2016, Alcoa Inc
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