** NH3 Clean Energy NH3.AX gains as much as 9.5% to A$0.023, highest since Nov. 28
** Co signs MoU with Australian Gas Infrastructure Operations Pty regarding the construction of pipelines for the transportation of carbon dioxide from co's WAH2 Clean Ammonia Project
** Says WAH2 project is its flagship project that supplies low-emissions ammonia to decarbonising powerhouse economies of Asia Pacific
** About 558,000 shares traded, 1.1x the 30-day avg
** Stock has risen 75% this year, as of last close
(Reporting by Sherin Sunny in Bengaluru)
((Sherin.Sunny@thomsonreuters.com))